A comfortable mask with 3D cut, adjustable earloop, headband, and nose clip ;
Premium Quality: Uncompromised Comfort & Protection. The MFF mask is our bestselling mask.
The mask has passed the ASTM F3502-21 Standard Specification for Barrier Face Coverings. The filtration efficiency of the mask is over 86% even after 50 washes, based on 70+/-20nm particles.
Test Report please see blow:
ASTM F3502-21 part 1
ASTM F3502-21 part 2
Washing instruction: https://3smask.com/g_q/ In how to “How to take care of the 3S Mask” section.